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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa9f9360e951da251d567bc55b407371f201822a2ac77b215963ce5241c804e4' 
  AND token = 'iSc6urR64WyoQQORK24cJUf6xm+HuDQ6pc7A/OZXlMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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