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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aa695e6a08e56d13e2510f39b13c206bc0bd225891bee8c9bc3f842ac051dcc' 
  AND token = '5+FXNfM3CQ92CL/0fw8U8SUP4zsouB1kQQuP94mGbHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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