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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ed5fd1c2bf48c6ff7dc1e790afbd9bcea5ceb3ae7abae7665e289b4a82dcde7' 
  AND token = 'U1yIB8MF7hl16+/1eeRMH7ERgfqcxTatsjKpEaQr7BY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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