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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db8a70a7b42fcd6b17c3736f90ae31f604066ef77772819bd7bd2caa302c350f' 
  AND token = 'svhoXh0LiBvRCDxPO4nK0f7FWgTlRb4TkY8vIPliA44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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