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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be6d28c81e8d2a3631fff9e6fa628ec00d4164a844c58f88796a50a0f6aba3ff' 
  AND token = 'Epi6acj93GwZwYGQi4UhHf8m8mzOQtQg8m9BxKS26V0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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