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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5fae9772f7a2f5f877bf7a1b5ee540dcb57dbe1800ffcd1560d8db8968cadfe' 
  AND token = 'NiqkNI1fV7EfHvABxSVHAFJWEs9Bjfl4D8gU/9szjEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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