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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ec29baeb477aff926e13ee733745a7b89fceec264d6f1ec2a5a21b79b61b82c' 
  AND token = '9ZE6HgqKIkcYOarhfcxy7Qv3whTIbzz9gaDmwy8nIT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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