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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9a24556cc8d64e2cae1b8c87b7ca6192539ef802206f1d0117a60aa2ae0bd5f' 
  AND token = 'ZBvDTqzWCLxD9K1HVqvNZPbQLZtuB0k2WJoxurkPBNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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