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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99994075a3d4f2047a46ff522558b0290987b9ecb8c6ca27abb43b51423f83a5' 
  AND token = '0tKtm1yS1WpEaCPaHIkxVDEpSOc8pDa3Q4asbcjkf5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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