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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '282ad6b5e26bce0f7989d23dc4f5d9482b62aa7e4b1ef39d082ba3a67506e9b1' 
  AND token = 'FfI960IO0LVUdfef2PR4YMcLeXOheHBMN0sfHmVjz68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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