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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80e58ebf7bc711bdd3b6b28b81607188b4253bdd0b2bb8efcef5d561e60c783a' 
  AND token = 'BdyEgtrbknN3HqyBrep3UZis83EhbekSDtR6Xlgjy5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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