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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '035ead184b43a81321c9c1c9eae06ecbca496b3069c92d526ba0a125dba1b4ad' 
  AND token = '7BlmK0Xuj6HhXY1rh3lMz3qnMrdnYZJ/JKEHQLfDEvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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