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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24f8a77ab7f4fd741689a0af16855be6e4713581fff2ab1aa1bf7c57720307d3' 
  AND token = '9p+UV63Qho5PCArpQPSV+iMMh1WE1l5+9Q2kOxwc9uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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