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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dd339d32261eafc0ae6555d7b98da51e67633de2b60ad26d9131bc3c5fb47c6' 
  AND token = 'SdTCSVvN6gUZ7bSmyFZ+4YSe6h5ffsJg9a9bBdC+A5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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