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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '837330a1f010259728878c7a861567fe510da06fc364078803eff97e17ca14b3' 
  AND token = 'm86x0iOHCiBGRtLii8FbGuhPYECGfp7bEb2xTSFe+yE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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