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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1fbe47ee8ce18fe71440d46ff40e1b54b63b133d80a13eba483a88cf73965b7' 
  AND token = 'hxO8VxmfVuJoC2jriibFfH1JzQer3/5aoL9mhPm3a3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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