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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '768c46d7fb62a5fb16b4e403b01e1b0a820d3770668bfb74da1adf6cc15495e2' 
  AND token = 'sz+6DfGk6RDVR715oVXdtYJGY1NyGkavGAqVoqLPq9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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