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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '683dc8c925654e59a3fddac8e433adda49dfb52ec59c8d32835966d7cf446727' 
  AND token = 'eqdBU2HxMita/P1/n8CVmos3FS3HxeF7g2e7K9Sfp/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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