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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '091872750a47441d20c23baf0917ab488d7bcafb3adb0ca864da3a8c34cc7535' 
  AND token = 'wtRyqNCf+4biqphJDVc7BryfzOh9ZbklNmhrh8XYM1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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