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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f9909730784b4b659c70d863236531676c9e8e4a807575a37de2edf4d165124' 
  AND token = 'Nw1WREUvoQ0jWD9Isc83nAksT92DmHvXDOObRCw6L8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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