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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbfd75d792ee7a8c6616f1e94792fd0d30706b3e07b9ea43b97312e714c46080' 
  AND token = '/ZtNzrxLQx0gptzFiTguKvQlf6aT/mZpHo2IbYNieIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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