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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0031a9fc9fcd8ce2aebdf39efec32d439c06e71ab3766d351cc1acb657378219' 
  AND token = '3Rd86S3XpQREv4Pj3Y+duS5WE6bawMwQjhdl7uPp+TM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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