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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '944e70398b14a95af30477f5d83e596422d39f2f73e2f53112f9e56d031d4511' 
  AND token = '+P14ak8CY0wwbT06jz2bMtYhEGHZaYZ0Rg8We/VEh5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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