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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b18085d6f9d235eeb6ea3977a919537fd6c37845ce2082a1d3344b35344fe826' 
  AND token = '7fIIRULTXwEeaNqdsXEov5dB2ihHa1v8Y263F0Q0YpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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