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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fa8bedb52a0d0a20d8cd9e2313980c5aba202b5ec546b63b1902486398d39ae' 
  AND token = '94R+sNdnZeR5+IsxvXZt3quSVrqdLAw7Pk5FVAxZ8Yg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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