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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62a5f6ff85aa1b7d1bd9254389bdd5c339ee2125b2c8d7a75e7f1c330bc52c64' 
  AND token = 'fHH3+7syrzhagEgkj+35qWnbgnzj/sn2OL95dnJmZ/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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