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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4da6b5baebdb7004dbe79c9759c7baf99a93d384f5f8f28ce5a030832d395719' 
  AND token = 'p8yYys9dc7IjsJbMfkk1FQOTlNDAJSVB61O7p3QSjQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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