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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00710a26dcea31090fc6a4e03c624f7d525af7c04df91e75ee06a9f24c0b70cc' 
  AND token = 'WBqkj9N7JMAvqBywIq2RZYqANejNh2mI1zhtAccCWeo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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