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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '028bd1bd60ef458f5715cf297e0d25d2d5eb83614c13fb2e28a0d9b40b3e657c' 
  AND token = '4nr16BOD63O9snrJhRX4ur9BNVw1cQHVzRQcvtMEHgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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