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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20f9828ed366bf130ff8ec49cccdde8261d81dfde6c8a8cd6e1f6968accf1d0a' 
  AND token = 'oKzCvRrIbBHr92jmlVN71O98GihwFa1dUyaQPuODVtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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