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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b73f2232f0df5e99db2a735e26a63139aee5c77eb10e2a77c96a16f27d0292da' 
  AND token = 'uHnQxrW5+cwJn8OhL4i7wvy1tEpcXg1Rc/Kw9dWI2sY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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