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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebbe0688978ed450570d767d02d7b0fb580dc1d2210b7fdd2a7cfcd6ae5dc65d' 
  AND token = 'drI+AQPlZpvGfDeshJYinJNuDanb60msp9Gxk/2t6sY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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