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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd62c78ef801be0c46d594ab44e00cf2462dc5669bfeea11feb598d8946e6c0d9' 
  AND token = 'WLl60GjHMu1jD2soP6D6eYTFlm63a/8dQNgq600SyKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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