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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3b9d4df24542e29d5adf679ecd6055ac7db7d433b4412abfcaaa244b1e38bb4' 
  AND token = 'Q0l9HyCWUNZRaZ9sFRa5/4EQ3dvQTVUbXUosGaSyvE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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