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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef3bd0979f888d56cf0f19cd6eeb0eb6fe42ac72c8220bff9abe46d7d91eeebc' 
  AND token = 'HS61B3FarQdhwQiQ6Ze1ctGbmqqpGbe+opnsf3rQtLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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