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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c9f441414fa005a7c9a512e6d071123a4c41005be85b1412379ff33f428417c' 
  AND token = 'SaJ9L8XVkT/voLYy0DM6fFKmA5DhE/BkomfsSQFFE1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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