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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4392a9156229d204bdbea8b7b53f66144207e41756c1b7efbd41465db0001f8' 
  AND token = 'uktlzDhbOsdBQUsMIU93cS8d5wWTVGEr4MB5YMuy8sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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