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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baa3a2f649e9c10c0d8e7e4d9f9ad96add12cbb2c03ed73fb5023c8f6b82ab56' 
  AND token = 'CqQw4/wPmNzceVvTb3wMIOo2oxdFV+vpDWSaoXSJlN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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