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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '468bc42820e9e9d17b6c6ea053cc98aa3277524195c7bc6a9d440f91a7df7ffb' 
  AND token = 'LhkvH79oLjIW3o1mg8k8sDUkoh0fkkiT4M/857yDMYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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