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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a30cff9269f64588b4f4c81ebb1b1982682536a2f6da554fdcfb5de7e2a3ff5' 
  AND token = 'jC/v5E3OJ/3CbYjnTO8mqgi6/InDctmoS0Ud8EFX5UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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