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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '360e29b8c2893f6cf8ef7cbffe8f70a0bb19b2882c46528540730230789944c4' 
  AND token = '5sbY/5+KcD6vJiAT+j+XgRCi7by+MMOpCE6zYQ2qux0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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