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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47b2ac95c41347710ab1d87e7e6362d5e5fa6701b24ae018c2ba58c85b8df0b5' 
  AND token = 'KtfNpXS/z8RPEnciP7pEOW7Iuk/8y/05HAOQy0cJCZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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