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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bfd57495e137b920ed528ccee5c69a12e6dbb19dc06368a44c4f50035dcda57' 
  AND token = 'c8/VmXPp1j0ZH1YprkeD7a/nUoYFbGhMsash09tmli8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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