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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a033b0cd07981637350ae3635bfa3374909d408dd174cda15a81310309988bc8' 
  AND token = 'yEs+sKOaD9vkNPvggXviVmh73+RSvIFjohqitrMt22I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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