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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e04eb8d5c789d57f8e97fa6dfbe179b6db8b8fa092bd9bfdbc0aa25df9e12b56' 
  AND token = 'COPNmdRn8JVypU9UfDSwwbc1u8hMdc7032vbKzxzTFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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