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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fb717672e87b8a453cb206ec444f1b26406706c07755a628ee81792194fca79' 
  AND token = '5fYNb98MXlIWol2hHs6LhReYt5ydmV23j3hhKZcesKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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