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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d14fd8a957d560446319785e3416f1bd5f28e30aaa6aa0908590e41b0d35690' 
  AND token = '4sZVZ5sswIGYi0Ay9EbonckC6eVQd+1Ck2ITv4yxhcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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