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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9e9967d7a8ba4177a74ea8ecba877c88c77dbd1db5dc55da2eef91d7f0565d2' 
  AND token = 'hqtR5t65qA9K3Jdwr+/4DsRAa355wU2BCRiV/lx2TJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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