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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3f7ae452c9b0612c59b8369ff82cae974e9b8c26c9d18bf15fd17e04ae651b4' 
  AND token = 'yYCeomHsokZJp4jXZ0dfQyAK6T/ZdRIo414Q9dErztM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}