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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92ec9ca7a3dd7a962cf1efd450d38f165f686e267ff2d21631322ec28dd7c912' 
  AND token = 'KP8cojSP/PVf93dSBpj6VQhPqWzF1CentsHJFYRyL6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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