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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7a0e8fa471b97b6fe9a339a51087318c2b7a440688081a781c1275c34295b35' 
  AND token = 'CfCyMGu2aDYJY+WLp3stvi5bNXQsnpkGDhwYhmm3L1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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