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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9b3fa25c1c974f6ea421f7567334beff6a079fcd7f4d37e083e4e4bf3831f65' 
  AND token = 'p+UlSLcMVubWe5mmgp/p/Zn3+XtxbN+4ExYahWaFYXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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