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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd8d9f4955795fa40187dda7c1f59a10c7ca998e9b608644c724222895854fc3' 
  AND token = 'fQdVgWU0bkZtXN4pd/dJhs84hFjkPA3Ywgwus9hGNG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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