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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e75f0d130361ffc1835049275e1cc93b5fa947d1ecac93bb2974592d104f9b9b' 
  AND token = 'mpX/Sp9NdW4yiOgpYbWo4Y/pQVjiGWFSfCT38hwITII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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