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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '801930c63a36c3e8c77fd097f12b7fd58ddd1dae21a579459e58d57aea174ed3' 
  AND token = 'hZ03wuT4OLa/PMDV9zIPHWFHc0g6uWSKAj1T6H6ILO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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