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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eecab31e0f7c54aff0aee731bb6186358ac7dba66f94ecc2b64ef6caea7bf8ad' 
  AND token = 'E454U1McM8zT3ZeT2hFpf4tJgbwt3jZxZijg8iToIPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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