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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36229f31138fe06315832c088f246c462e2a25c480ee67f7e63efda1a036b12c' 
  AND token = 'U1w+1UVfDpl7vMvgp6kU3aqkmc8m1fcCWRKPlQgjhrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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