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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bfb2e8f82b8ca03f7d980666890bdc2ebb13836c8f8cddb87b1cd4391490670' 
  AND token = 'mkNb5j0MlBv55s5SDtQJOt7xPz1O8QfuZJ1JM8O83W8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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