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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d15a9a13b7badf73830c58d7b0a92017ae09453f4b754a1f8a91aa62138c5f4' 
  AND token = '5PfNcpZ6qvIJih7KT81RHV8pzeo6jNH89YTyfQtWOu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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